Awater heater tank holds 280 gallons. two percent of the water is lost as steam. how many gallons remain to be used?

Hi!

The answer is 274.4 gallons of water remain to be used.

Step-by-step explanation:

You can use the Rule of three to solve this problem.

     100% ----> 280 gallons  // If 100% is 280 gallons

     2% ----> x gallons  // then 2% would be x gallons.

Now, multiply 2% by 280 gallons and divide the result by 100%:

 // % divided by % is 1.

gallons losted as steam.

To calculate the gallons remain to be used:

280 gallons - 5.6 gallons = 274.4 gallons.

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a